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Rocky Mountain National Park officials closed one of the park’s entrances Wednesday after a ranger and a driver exchanged gunfire nearby.

A park ranger made a traffic stop at approximately 10:20 a.m. near the park’s Fall River Entrance on U.S. 34 and the driver and the ranger exchanged gunfire, Colorado State Patrol spokesman Trooper Josh Lewis said.

Both the driver and the ranger were transported to the hospital but Lewis did not know the extent of their injuries, the Denver Post reports.